Skimmer Help.

[doch]

Hello all....
So I'm new to this hobby, have within the last month or so set up a 90gal and am now looking into getting a skimmer going. Now in my travels I have seen the price of salesman (trusted source, btw) recomended skimmer without a pump to be about $400. When I look on E-bay I see the average price to be around the $100-ish range. Are these skimmers garbage? Am I going to waste my money buying one of this price range? Does anyone have any recommendations for a 'cheap' and good skimmer? The one that caught my eye on e-bay is called the TS-2000 Turbo Skimmer. Is anyone familiar with these? To me it looks the same as these expensive ones in the stores, but I don't know really what to look for. Any help is appreciated, thanks ahead of time.